Story highlights
A suicide bomber attacked as people were trying to save victims of an earlier blast
ISIS claims responsibility
At least 22 people were killed in a suicide-bomber attack at the scene of an earlier bombing in Baghdad, police officials and medical sources told CNN on Tuesday.
There were also at least 45 people wounded by the twin bombings in the al-Kadumiya area. The explosions occurred as people were trying to drive into the city before a midnight curfew.
Police said the first bombing was a suicide car bombing. The second bomber went into the crowd of rescuers, who were trying to save victims, most of them civilians.
The terrorist group Islamic State in Iraq and Syria, or ISIS, claimed responsibility on its website and said it targeted security workers and troops at a checkpoint.